{% with messages = get_flashed_messages(with_categories=true) %}
    {% if messages %}
        {% for category, message in messages %}
            <div class="alert alert-{{ category }}" style="text-align: center">
                <button data-dismiss="alert" class="close" type="button">×</button>
                <strong>{{ message }}</strong>
            </div>
        {% endfor %}
    {% endif %}
{% endwith %}
